This video grab taken from undated UGC images posted on social media shows smoke billowing as explosions rock Iran's Isfahan. AFP
"Initial assessments indicate massive attacks, with significant damage and destruction to production units" at the complex of the Mobarakeh Steel Company, one of Iran's biggest, in the central province of Isfahan, Fars news agency reported, quoting a statement by the company.
It added that the fresh attacks took place on Tuesday evening, hitting the complex in Isfahan as well as one of the company's subsidiaries, Sefid Dasht Steel, in the southwestern Chaharmahal and Bakhtiari province which "sustained damage and losses".
US president Donald Trump shared a video showing huge explosions lighting up the night sky after the attack.
The complex in Isfahan was also attacked on Friday along with Khuzestan Steel factories in southwestern Iran.
On Tuesday, Iranian media reported a wave of US-Israeli strikes on civilian facilities, including a cancer drug plant, a religious site and a desalination plant .
State media reported the Grand Husseiniya, a Shia religious centre, was damaged in Zanjan in the northwest.
Airstrikes also hit a pharmaceutical plant producing cancer drugs and anaesthetics, while a Health ministry official told the ISNA news agency that a bombing had left a desalination plant on Qeshm Island in the Strait of Hormuz "completely out of service".
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